LC Zero
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Lc0 v0.23.0 has been released  16h05 01 décembre
Update: we have a bugfix release v0.23.1, download here. It contains no chess-play-related changes, the bug was in training game generation code.We have a new release today Download here.What’s new in the release:Support of Fischer Random Chess (UCI Chess960 option to enable FRC-style...
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End of era  13h44 26 juillet
The era of test40 has finished, that training of test40 has been stopped.Instead we’ve just started to train test60. What’s new there (relative to test40):Residual tower size is 320x24 (24 blocks, 320 filters).Policy head is AlphaZero-style (8à 8à 73 instead of plain 1858 vector).Value head is WDL...
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Nibbler: an Lc0 GUI  11h20 25 juin
Does the world need another Chess GUI? Some people say no, but they don’t have very many Chess GUIs, do they?I’m the author of Nibbler, the first Chess GUI designed specifically for Lc0, and inspired by the excellent Lizzie Go interface. Although Nibbler is a work in progress, it’s very usable, and...
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What’s going on with training   10h58 16 juin
I’ve just decided that maybe it’s a time for a post. Describing what’s going on and what are the plans, stuff like that There are some plans for the Lc0 engine itself, but that is a topic for another post. At least we hope to make releases more regular again (v0.21.0-rc1 appeared on February 16th,...
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Lc0 v0.21.2 has been released  15h25 09 juin
After quite a long delay we are releasing an update to Lc0, new version is v0.21.2.Download here.Changes include:Optimizations for GTX 16xx cards (cudnn-fp16 now works for them, even though it doesn’t give as much performance boost as for RTX cards). Sticky endgames feature (default on). This...
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Lc0 won TCEC 15  13h20 28 mai
Congrats. :)
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Training server is down  17h36 17 mai
2019-05-26 UPDATE: Temporary server is up again.2019-05-25 UPDATE2: Turns out cloud instance was preemtable, so it was preempted, no training again for now.2019-05-25 UPDATE: We’ve been donated a temporary AWS cloud instance for the time of the main server downtime Training is back up,...
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Competition Season   00h01 11 mai
Today, May 10, 2019, Leela is playing in the first game of the high profile TCEC Season 15 Superfinal. Leela qualified after she cleared Division P undefeated, winning at least once head-to-head against every opponent except Houdini. Her opponent in the superfinal is Stockfish, who lost...
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Backend configuration  09h55 17 avril
To break the silence of lack of posts in this blog, let me write about Lc0 backends configuration, as it has been totally undocumented so far.(For other options it’s possible to get rough idea of their meaning by running lc0 --help).So, there are two command line parameters and corresponding UCI...
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Announcing LcZ, the world’s first neural net based chess engine and interactive fiction amalgamation.  07h02 01 avril
After the huge success of the xyzzy extension to the UCI protocol introduced in Lc0, it was decided to take it one step further and introduce z-machine compatibility to the chess engine, giving birth to LcZ.Download windows binaries from: https: github.com borg323 lc0 releases tag first-releaseor...
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Upgrading to Lc0 v0.21.1 in CuteChess  10h45 25 mars
This a quick note for people who use CuteChess and just upgraded to v0.21.1 from earlier versions.Meaning of FPU-related parameters are changed in v0.21.1, along with default values of those parameters.If you upgraded your Lc0 to v0.21.1 in CuteChess by just replacing the files, most probably...
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lczero.org server will be unavailable on April 5th  09h35 21 mars
SummaryImportant The lczero.org server will be not available for 24 hours starting at April 4th 20:00 UTC. Training game generation will also not be possible during the downtime.For people who use payed services for generating games: don’t forget to stop your instances for this...
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Test40 update  19h24 18 mars
We recently did the 2nd LR drop for T40, and usually this is when the net approaches it’s strongest point (gains after the final LR drop are very small). External Elo tests show T40 is close to T30, and may have already passed. We will know more in the following few weeks. But coincidentally we...
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Leela falls just short in first TCEC Superfinal appearance  21h35 16 mars
Lc0 did well in it’s first TCEC Superfinal appearance, but fell just short of winning the match, losing 49.5 to 50.5. Here are some overviews of the Superfinal: The official TCEC summary Assaf Wool’s blog about the Superfinal. And to see the games themselves, see the TCEC archiveWe know this...
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Leela BOOMS Stockfish and TCEC Superfinal. She is leading with 2 points   13h42 16 février
nbsp;As per the usual expression of BOOM of TCEC chat when an engine finds something good, Leela right now is making a great surprise in her first appearance in a TCEC superfinal by leading after 64 games with 2 points more. A 33-31 score in favor of Leela.After a 14.5-14.5 score with 6 wins by...